JPA:A cycle is detected in the object graph

Question

HI Friends,
I am facing bit too many errors while working with JPA.unfortunately we dont have proper examples which can provided  clarity.
Here in my case : I have Two Entities
One to One bidirectional.
  EMPLOYEE
  CUBICLE.
Employee.java
@Entity
@Table(name = "CS1_EMPLOYEE")
public class Employee {
     @Id
     private int id;
     private String name;
    @OneToOne(cascade=CascadeType.ALL)
    private Cubicle cubicle;
     public int getId() {
          return id;
     public void setId(int id) {
          this.id = id;
     public String getName() {
          return name;
     public void setName(String name) {
          this.name = name;
     public Cubicle getCubicle() {
          return cubicle;
     public void setCubicle(Cubicle assignedCubicle) {
          this.cubicle = assignedCubicle;
Cubicle.java
@Entity
@Table(name = "CS1_CUBICLE")
public class Cubicle {
     @Id
     private int id;
     private String cubeName;
     // Bidirectional
     @OneToOne(mappedBy="cubicle",cascade=CascadeType.ALL)
     private Employee employee;
     public int getId() {
          return id;
     public void setId(int id) {
          this.id = id;
     public String getCubeName() {
          return cubeName;
     public void setCubeName(String cubeName) {
          this.cubeName = cubeName;
     public Employee getEmployee() {
          return employee;
     public void setEmployee(Employee residentEmployee) {
          this.employee = residentEmployee;
*sql file*
CREATE TABLE "CS1_EMPLOYEE"
    "ID"           Integer    NOT NULL,
    "NAME"         Varchar (12) UNICODE,
    "CUBICLE_ID"   Integer,
    PRIMARY KEY ("ID")
CREATE TABLE "CS1_CUBICLE"
"ID"          Integer    NOT NULL,
    "CUBENAME"      Varchar (12) UNICODE,
    PRIMARY KEY ("ID")
Session Bean(EJB)
when i test this method i am gettig the error(Method In Bean)
public Cubicle findCubicleById(int id)
     String jpql = "select c from Cubicle c where c.id = " +id;
         Query q = em.createQuery(jpql);
         Cubicle c = (Cubicle)q.getSingleResult();
         return c;
error
[com.sun.istack.SAXException2: A cycle is detected in the object graph. This will cause infinitely deep XML: com.sap.com.jpacasestudy1.model.Employee@1ae5bf7 -> com.sap.com.jpacasestudy1.model.Cubicle@75e38d -> com.sap.com.jpacasestudy1.model.Employee@1ae5bf7])->com.sap.engine.services.webservices.espbase.server.additions.exceptions.ProcessException: Connection IO Exception. Check nested exception for details. (Exception; nested exception is:  javax.xml.bind.MarshalException
I am unable to trace what the error is.Any help from SDN Experts?
Regards
Chandra Dasari
Edited by: chandra shekar dasari on Jul 16, 2009 1:48 PM:ver1te
Edited by: chandra shekar dasari on Jul 16, 2009 1:49 PM:code re

Answer 1

Unfortunately, even this thread is unanswered, i am closing the thread.as it it creating problems for further posting